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Where is the stator located in an external rotor motor?
As its name suggests, an external rotor motor is designed with the rotor on the outside and the stator housed inside the rotor. The external rotor design provides several performance advantages.
How is an external rotor motor different from a DC motor?
As its name suggests, an external rotor motor is designed with the rotor on the outside and the stator housed inside the rotor. The external rotor design provides several performance advantages. First, to house the stator, the rotor of an external rotor motor is by necessity larger than the rotor of a conventional DC motor.
Where is the rotor located on a brushless DC motor?
Conventional brushless DC motors are constructed with a permanent magnet rotor located inside a wound stator. But one type of DC motor is designed with the rotor on the outside and the stator and housed inside the rotor.
How is the mechanical time constant of a rotor determined?
As shown in the equation, the motor’s mechanical time constant depends in part on the rotor inertia. When the rotor is integrated into the impeller, the inertia of the rotor and impeller are considered together.
What are the windings of a rotor motor?
The Rotor The rotor consists of a cylindrical core composed of steel laminations. Slots cut into the cylindrical core hold the formed coils of wire for the rotor winding. The rotor winding consists of three single-phase windings spaced 120 electrical degrees apart. The single-phase windings are connected either in wye or delta.
What is the principle of operation of a stator?
PRINCIPLE OF OPERATION When three currents, 120 electrical degrees apart, pass through the three single-phase windings in the slots of the stator core, a rotating magnetic field is developed. This field travels around the stator. The speed of the rotating field depends on the number of stator poles and the frequency of the power source.